Introduces the Empty typeclass, which provides an 'empty' value for a given
type. Also includes automatic derivation of Empty for case
classes. Writing tests has never been so easy!
import com.gu.mockless.Empty.auto._
import com.gu.mockless.Empty.{empty => emptyInstance}
object Book {
lazy val empty = emptyInstance[Book]
assert(empty == Book(
"",
0,
Nil,
Map.empty
)) // true
}
case class Book(
title: String,
yearPublished: Int,
authors: List[Author],
references: Map[String, String]
)